mod_http_oauth2: Validate all URIs against client_uri in client registration Validating against all redirect URIs didn't work for OOB-only clients, which happens to be what I was testing with.

This module blocks configured queries that change server state.

E.g. to make vCard storage read-only:

``` lua
readonly_stores = {
	vcard = { "vcard-temp", "vCard" };
}
```